Checkerwork structure



Dec. 1, 1942. H. R. HILLER ETAL CHECKERWORK STRUCTURE 2 Sheets-Sheet 1Filed April 18, 1942 INyENTc 2 7 .ATTORNEYS Y Dec. 1, 1942. H. R. HILLERETAL CHECKERWORK STRUCTURE 2 Sheets-Sheet 2 Filed April 18, 1942SECTION-N- SECTIONM- mvEN gR s BY /z 3 12/424. 5 I Maw M22 ATTORNEYSPatented Dec. 1, 1942 2,303,741 cnnoxanwonx srnuc'roan Harvey R. Biiler,Chicago,

Ill., and Herman W.

Weber, Richmond Heights, Mo., assignors to Laclede-Christy Clay ProductsCompany, St.

Louis, Mo., a corporation of Missouri Application April 18, 1942, SerialNo. 439,498

l Claim.

This invention relates to checkerwork for regenerators and such likestructures, and consists in an assembly of blocks or tiles of a fewsimple shapes, easily fabricated, inexpensive and durable underhandling, that is adequate, secure, and adaptable in satisfying suchspecifications as the user may require.

In the accompanying drawings Fig. I is a view in perspective, showinganalytically the structure of the checkerwork of the invention; Fig. IIis a view of the structure in longitudinal section; Fig. III a view intransverse section. The portion of Fig. III to the left is upon theplane of section indicated at M, Fig. H, and the portion to th right isin the plane N. Figs. 1V, V, and VI are views in plan and in elevationof particular tile shapes used in the structure; and Figs. VII and VIIIare views in elevation of tiles, otherwise corresponding to those ofFigs. V and VI, but differing in one dimension, and so adapted to aifordvariety in the structure.

The checkerwork of the invention will ordinarily be built within acubical cell I, and will rest upon arches 2, as indicated in Fig. I.

We provide tiles A, such as shown in Fig. IV,

of Greek cross shape in plan. These tiles are in overall thickness suchas ordinary tile for this use-a thickness here given, by way of example,of 2 inches. In length these tiles define one .dimension of the flues,and here, by way of example, the length is 9 inches. In height thesetiles may for example, be 4% inches. The cross shape is aii'orded byre-entrant square-covered recesses at the four vertical edges of whatotherwise would be a simple parallelopiped. These recesses, in thedirection of the length of the tile, are 1% inches deep-one half of thethicknessof the tile itself;and, in the direction of the thickness ofthe tile, they are of suflicient depth to afford support for thetransverse tile presently to be described. Here, for example, the depthis shown to be an inch.

In the building of the checkerwork we set tiles A in end-to-endsuccession, in courses that intervene between courses of tile D and E,of plain parallelepiped shape; and thus we form a succession oflongitudinal walls 3 that are continuous and imperforate but are formedwith a succession of horizontally extending lines of mortises 4. Inthese mortises rest as tenons the ends of the transversely extendingtile that divide the spaces between the walls 3 into flues. The walls 3extend in parallelism and are spaced at suitable intervals-8 or 8inches, for example.

Fig. V, of Greek cross shape in elevation. These tiles will convenientlybe or the standard thickness 2% inches. In length, these tilescorrespond to the spacing of the walls 3. If that spacing be 8 inches,the tiles B will in the body portion be 8 inches long, while the arms ofthe cross extending half an inch farther, will give an overall length of9 inches. Re-entrant square-cornered notches at the upper and lowercorners will be half an inch deep in the direction or the length of the,tile; while the vertical extent of the notches will be such as to leavethe arms of the cross 4 inches in their vertical extent-a dimension thatcorresponds to the vertical extent of the mortises in the walls 3.Inthis case the overall height of the tiles B is 6% inches.

In building the 'checkerwork courses of tiles A I are set upon coursesof tiles D. Tiles B then are placed, bridging the spaces between thecourses of tiles A, the arms of the tiles B entering as tenons themortises formed by and between the meeting tiles A, the arms of thetiles B resting upon the edges of the tiles D. When the tiles B have sobeen placed, one or more courses oi plain parallelepiped tiles E are setupon the course of tiles A, and again a course of tiles A is laid. Thenagain tiles B are set as before, and so the building progresses.

The notches in the corners of the tiles B are here shown to be 1% inchesin vertical extent. Accordingly, if the course or courses that intervenebetween courses of tiles A be greater in vertical extent than 2% inches(as ordinarily will be the case, and, as here shown, is the case) thetiles B in vertical succession will stand apart, as indicated at a andb, and the flues in the checkerwork will be thus interconnected, as iscommonly desirable. It is manifestly, however, a matter of dimensions,so to design the component tiles that the tiles B shall come toedgeto-edge contact vertically, and in such case the transverse walls aswell as the longitudinal walls -will be continuous and imperforate.

Preferably we provide tiles B, such as shown in Fig. VII serves toindicate shorter tile C that may be used in place of tiles B, to bridgethe space between walls 3, if those walls be set at correspondinglysmaller intervals.

Figs. VI and VIII serve to show that half tiles B and C, correspondingin other respects to tiles B and C, may be provided for convenienceawell-known expedient in masonry.

- Marginal tile 5 and 6 of special shape may be provided to complete atight structure within the cubical cell I. Blow holes 1 may be providedin the cubical walls, as is usual, for blowing from of tiles ofrectangular paralleloplped shape, with 10 intervening courses of tiles0! Greek croee shape in plan, whereby opposite mortise: are iormed inopposed faces of two such wells, and tiles of Greek cross shape in sideelevation extending transversely between the two wells, with the arms ofthe cross lying as tenons within the opposed mortises, and forming withthe walls vertically extending flues. 3

HARVEY R. KILLER. HERMAN W.

